Quote:
Originally Posted by Ernie Rogers
Okay, guys,
I think you have wandered off the topic. (It was aerodynamics of a high speed car without ground effect.)
Shinkansen Bullet Train....................100 gm CO2 /passenger mile
U.S. Train.......................................95
Transit Bus.....................................64
Prius (two people)..........................131
Airlines.........................................3 23
X Prize car (100 mpg, 2 people)..........59
New 8 passenger rail car...................13 gm CO2e /mile
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From another angle that looks a a slightly bigger picture...
BTU per passenger mile (2006)
Cars............................ 3512
Personal Truck.............. 3944
Motorcycles................. 1855
Demand Response*........ 14301
VanPool....................... 1322
Buses (transit).............. 4235
Air (certified Route)........ 3261
Rail (all)........................ 2816
*Dispatched services
Source
Chapter 2 Energy - Transportation Energy Data Book
What's confusing me is why you want to ignore ground effect while having rail (I understand you're thinking raised rail - but losses from these stationary objects will be significant).
But that said, I concur with aerohead - I don't remember the specific source, but I have read of theoretical limits approaching .04.